“In this particular case we have received information relating to the safety of West Midlands Police officers and police staff. There is nothing at this time to suggest there is an increased risk to members of the public.

“We have taken the opportunity to remind all employees of the need to be vigilant. Our priority remains serving our communities and protecting them from harm. Officers remain on patrol and our staff continue to respond to calls for service as usual.”

Officers were held on duty while they were given the security reminder, as well as advice about police station security, as they started their shifts.

In October the threat level to police officers across Britain was raised to substantial. This means that an attack is a strong possibility.

The national security level remains at severe meaning a terrorist attack is highly likely.

Anyone with security concerns should call police on 101 or 999 in an emergency.